JP2001216915A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube that can make negligible the shadow made by a damper wire, to cope with the flattening trend display screens. SOLUTION: In a cathode-ray tube which comprises a color-selection mask body consisting of plural tape-type grid elements arranged at a prescribed pitch between a pair of supporter members opposed to a frame, and a damper wire 7 for oscillation prevention, stretched on the face of the color-selection mask, at least a part of the side of the damper wire 7 is a plain face A so that the section C which is cut at right angles longitudinally may have a polygonal shape, or a shape surrounded by arcs including a circular arc and chords, and the plain face is in planar contact with the color-selection mask.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube used as a display device.

[0002]

2. Description of the Related Art In recent years, screens of television receivers and the like have become flat and large, and the definition of the screen has been remarkably improved. The width of the tape-like grid element of the aperture grille that constitutes the cathode ray tube (hereinafter also referred to as CRT (Cathode Ray Tube)) used in the above-mentioned television receivers is becoming increasingly narrower, and the grid spacing is also fine pitch. Is becoming

FIG. 1 is a schematic side sectional view of the above-mentioned cathode ray tube, and FIG. 2A is a schematic perspective view of an aperture grille assembly in a state where the aperture grille is held by a frame. The cathode ray tube has a tube body composed of a panel 20a, a funnel 20b, and a neck portion 20c integrally formed of glass. An electron gun 21 is arranged on the neck portion 20c. A filter (not shown) is formed. The inside of the panel 20a is provided with an aperture grille assembly, which is one type of a color selection mechanism.

As shown in FIG. 2 (a), an aperture grill assembly is formed by a plurality of tape-like tapes between a pair of outermost tapes 2 facing left and right of a mask portion of a cylindrical aperture grill 1 made of a thin metal plate. The grid element bodies 3 are provided at a predetermined pitch, and are provided with a pair of support members 5 opposed to each other on the frame.
It is created by welding on a stretched state. In the aperture grill 1, at least one damper wire 7 for preventing vibration is stretched so as to cross the mask surface composed of the tape-shaped grid body 3 provided between the support members 5 of the frame. Both ends of the damper wire 7 are welded to one end of a damper spring 8. Also,
The other end of each damper spring 8 is welded and fixed to both outer sides of the arm member 4 facing each other. As described above, the damper wire 7 is stretched between the pair of arm members 4.

FIG. 2B is an enlarged view of the damper spring 8. The damper spring 8 is provided with a frame welding portion 8a at one end of a plate material and a bent piece 8b at the other end. A damper wire 7 is welded and fixed to the bent piece 8b by seam welding using a stainless steel tape 8c. The frame welding portion 8a of the damper spring 8 is connected to the opposite arm member 4 of the aperture grill 1.
The damper wire 7 stretched between the opposed arm members 4 traverses the tape-shaped grid body 3 in a state of being in contact with the tape-shaped grid element 3 while maintaining the tensioned state due to the elasticity of the damper spring 8. The tape-shaped grid body 3 is stretched in the
Is vibrated, the vibration can be promptly attenuated by the frictional resistance between the damper wire 7 and the tape-shaped grid element 3.

FIG. 5 is a partially sectional perspective view of the above damper wire 7. The damper wire 7 is made of, for example, tungsten, and has a cross section C orthogonal to the longitudinal direction having a diameter of 10 to 10.
It is a wire having a circular shape of about 20 μm. The breaking strength of the damper wire 7 is proportional to the cross-sectional area of the wire, for example, about 40 gf for a diameter of 10 μm and about 100 gf for a diameter of 20 μm. The damper wire 7 is stretched with a tension less than the above-described breaking strength so as to sufficiently contact the tape-shaped grid body 3.

One end of a spring holder 22 is fixed to the arm member 4 and the support member 5 of the aperture grille assembly, and a spring 23 having a fitting hole 23a is fixed to the other end of the spring holder 22. The aperture grille assembly having the above-described configuration is fixed to the inside of the panel 20a by fitting into a projection 24 provided at a suitable place on the inner surface of the panel 20a.

In the above-described cathode ray tube, the electron beam (cathode ray) emitted from the electron gun 21 passes through the aperture grill 1 while being selected by the color, and for example, the red light existing in the phosphor layer provided on the inner surface of the panel. Each phosphor emitting green and blue light is excited, and a color image can be displayed by the fluorescence emitted from the phosphor of each color.

[0009]

However, since the display screen of a cathode ray tube in recent years has become flatter,
Although the cylindrical aperture grille is slightly curved, it is becoming substantially flat, making it difficult for the damper wire to contact the tape-shaped grid body with sufficient frictional resistance. .

In a cathode ray tube having a color selection mask using the above damper wire, since the damper wire does not transmit the cathode ray, a shadow is formed at a position corresponding to the position where the damper wire is stretched on the display screen. However, as the resolution of the screen has increased, the shadow created by the conventional damper wire has become more noticeable, and the appearance of the image displayed on the display screen has been impaired. This has been an obstacle to displaying high-definition images on the screen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and accordingly, an object of the present invention is to provide a cathode ray tube which can cope with flattening of a display screen and make shadows produced by damper wires inconspicuous. It is to provide.

[0012]

In order to achieve the above object, a cathode ray tube according to the present invention comprises a plurality of tape-like grid elements provided at a predetermined pitch between a pair of opposed support members of a frame. In a cathode ray tube having a color selection mask body and a damper wire for preventing vibration stretched on a surface of the color selection mask body, at least a part of a side surface of the damper wire is flat, and the color selection mask is provided. Surface contact with body.

The above-mentioned cathode ray tube of the present invention preferably has a cross section perpendicular to the longitudinal direction of the damper wire having a substantially polygonal shape or a shape surrounded by a substantially arc and a chord.

In the above-mentioned cathode ray tube of the present invention, preferably, both ends of the damper wire are fixed to one end of a damper spring, and the other end of the damper spring is fixed to the frame. Alternatively, preferably, a slit-shaped opening for attaching the damper wire is provided in a pair of the endmost tapes facing each other of the color selection mask body, and the endmost tape portion outside the slit-shaped opening is provided on the endmost tape portion. Both ends of the damper wire are fixed.

The above-mentioned cathode ray tube according to the present invention comprises a color selection mask comprising a plurality of tape-like grid elements provided at a predetermined pitch between a pair of opposed support members of a frame; A cathode ray tube having a vibration-preventing damper wire stretched over the at least one side surface of the damper wire, such as a polygonal cross section orthogonal to the longitudinal direction or a shape surrounded by an arc such as an arc and a chord. The part is flat and is in surface contact with the color selection mask body. Therefore, since the damper wire and the color selection mask body, which have been in contact with each other in the past, are brought into surface contact, the frictional resistance between the two can be increased, and the tape-like grid element can be caused by various external impacts. When the body vibrates, the vibration can be damped faster. In addition, even if the color selection mask body such as the aperture grill becomes substantially flat, the damper wire can contact each tape-shaped grid element body of the color selection mask body with sufficient frictional resistance, and display. It is possible to cope with a flat screen. Furthermore, it is possible to make the damper wire thinner by the increase in the frictional resistance between the damper wire and the color selection mask body, so that the shadow created by the damper wire can be made inconspicuous.

The cathode ray tube of the present invention has a structure in which both ends of a damper wire are fixed to one end of a damper spring, and the other end of the damper spring is fixed to a frame, or a color selection mask body is opposed to the frame. A pair of outermost tapes is provided with a slit-shaped opening for attaching a damper wire, and both ends of the damper wire are fixed to the outermost tape portion outside the slit-shaped opening, so that the damper wire is provided. May be stretched on the surface of the color selection mask body in a direction crossing the tape-like grid body while keeping the tension state while keeping the tension state.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cathode ray tube according to the present invention will be described.
This will be described in detail based on an embodiment shown in the drawings.

First Embodiment FIG. 1 is a schematic side sectional view of a cathode ray tube (CRT) according to this embodiment. FIG. 2A shows an aperture grille assembly in a state where an aperture grille is held by a frame. It is a schematic perspective view. The cathode ray tube has a tube body composed of a panel 20a, a funnel 20b and a neck portion 20c integrally formed of glass, and the electron gun 2 is attached to the neck portion 20c.
1, a phosphor layer coated with blue, green, and red light-emitting phosphors and a filter (not shown) are formed on the inner surface of the panel 20a. The inside of the panel 20a is provided with an aperture grille assembly, which is one type of a color selection mechanism.

As shown in FIG. 2 (a), the aperture grille assembly is formed by a plurality of tape-like tapes between a pair of outermost tapes 2 facing the left and right sides of a mask portion of a cylindrical aperture grille 1 made of a thin metal plate. The grid element bodies 3 are provided at a predetermined pitch, and are provided with a pair of support members 5 opposed to each other on the frame.
It is created by welding on a stretched state. In the aperture grill 1, at least one damper wire 7 for preventing vibration is stretched so as to cross the mask surface composed of the grid-on-tape element 3 provided between the support members 5 of the frame. Both ends of the damper wire 7 are welded to one end of a damper spring 8. Also,
The other end of each damper spring 8 is welded and fixed to both outer sides of the arm member 4 facing each other. As described above, the damper wire 7 is stretched between the pair of arm members 4.

FIG. 2B is an enlarged view of a damper spring 8 portion. The damper spring 8 is provided with a frame welding portion 8a at one end of a plate material and a bent piece 8b at the other end. The damper wire 7 is seam-welded to the bent piece 8b by using a stainless tape 8c.
Are welded and fixed. The frame welding portion 8a of the damper spring 8 is welded to both of the opposed arm members 4 of the aperture grill 1, but the damper wire 7 stretched between the opposed arm members 4 is in a tensioned state by the elasticity of the damper spring 8. The tape-shaped grid body 3 is stretched in a direction crossing the tape-shaped grid body 3 in contact with the tape-shaped grid body 3 while maintaining the above condition. Due to the frictional resistance between the wire 7 and the tape-shaped grid body 3, the vibration can be rapidly attenuated.

The above-described damper wire 7 is a wire made of, for example, tungsten, has at least a part of its side surface flat, and is in surface contact with the aperture grill 1.
FIGS. 3A to 3C are examples of partial cross-sectional perspective views of the damper wire 7. In FIG. 3A, a cross section C orthogonal to the longitudinal direction has a substantially quadrangular (substantially square) shape, and for example, a surface A is a contact surface with the aperture grill 1. In FIG. 3B, a cross section C orthogonal to the longitudinal direction has a substantially triangular (substantially equilateral triangular) shape, and for example, a surface A is a contact surface with the aperture grill 1. In FIG. 3C, a cross section C orthogonal to the longitudinal direction has a substantially semicircular shape (a shape surrounded by an arc and a chord), and for example, a surface A is a contact surface with the aperture grill 1. In the damper wire having each of the cross-sectional shapes described above, the corners may be appropriately rounded. In the aperture grille 1 described above, the frictional resistance between the damper wire and the aperture grille increases. Therefore, the cross section orthogonal to the conventional longitudinal direction can be made thinner than the conventional damper wire having a circular shape.

The breaking strength of the damper wire 7 is proportional to the cross-sectional area of the wire. To obtain the same breaking strength as a conventional damper wire having a circular cross section perpendicular to the longitudinal direction, for example, FIG. When the cross section orthogonal to the longitudinal direction shown in a) is a substantially square shape, the length of one side of the square shape can be made smaller than the diameter of the conventional circular shape,
This also allows the damper wire to be made substantially thinner. When the breaking strength is reduced (the tension applied to the damper wire 7 is reduced) by the increase in the frictional resistance between the damper wire and the aperture grille, the damper wire can be made thinner. The damper wire 7
Each of the tape-shaped grid elements 3 is stretched with a tension less than the above-described breaking strength so as to sufficiently contact the tape-shaped grid elements 3.

One end of a spring holder 22 is fixed to the arm member 4 and the support member 5 of the aperture grille assembly, and a spring 23 having a fitting hole 23a is fixed to the other end of the spring holder 22. The aperture grille assembly having the above-described configuration is fixed to the inside of the panel 20a by fitting into a projection 24 provided at a suitable place on the inner surface of the panel 20a.

In the above-mentioned cathode ray tube, the electron beam (cathode ray) emitted from the electron gun 21 passes through the aperture grill 1 while being color-selected by the aperture grill 1, and emits, for example, red light existing in a phosphor layer provided on the inner surface of the panel. Each phosphor emitting green and blue light is excited, and a color image can be displayed by the fluorescence emitted from the phosphor of each color.

According to the cathode ray tube of the present embodiment, since the damper wire and the color selection mask (tape grid element of the aperture grill) are in surface contact, the frictional resistance between the two can be increased. Therefore, when the tape-shaped grid body vibrates due to various external impacts, the vibration can be damped more quickly. In addition, even if the color selection mask body such as the aperture grill becomes substantially flat, the damper wire can contact each tape-shaped grid element body of the color selection mask body with sufficient frictional resistance, and display. It is possible to cope with a flat screen. Further, since the frictional resistance between the damper wire and the color selection mask body increases, it is possible to make the damper wire thinner, whereby the shadow created by the damper wire can be made inconspicuous.

Second Embodiment The configuration of a cathode ray tube (CRT) according to this embodiment is the same as that of the first embodiment shown in FIG. FIG. 4A is a schematic perspective view of an aperture grille assembly fixed inside the panel 20a of the cathode ray tube according to the present embodiment.
FIG. 4B is an enlarged view of a portion of the outermost tape 2 which is a so-called solid tape of the aperture grill assembly shown in FIG. As shown in FIG. 4A, a plurality of tape-shaped grid elements 3 are arranged at a predetermined pitch between a pair of endmost tapes 2 facing left and right of a mask portion of a cylindrical aperture grille 1 made of a thin metal plate. And are welded in a stretched state onto a pair of support members 5 facing each other on the frame. In the aperture grill 1, at least one damper wire 7 for preventing vibration is stretched so as to cross the mask surface composed of the tape-shaped grid body 3 provided between the support members 5 of the frame.

In the above, a slit-shaped opening 10 having a shape different from the slit of the color selection mask portion is formed in each of the pair of endmost tapes 2 which are formed wider than in the prior art. For this, a shape that gives a spring effect to the damper wire 7 can be selected as described later. Both ends of the damper wire 7 made of tungsten or the like are welded and fixed to the outermost tape 2 portion outside the slit opening 10 by a support piece 11 made of stainless steel or the like.

When both ends of the damper wire 7 are welded to the endmost tape 2, the arrow B in FIG.
In the state where the outermost tape 2 outside the slit-shaped opening 10 is deformed so as to close the slit-shaped opening 10 by applying a force in the direction of FIG. When the above-mentioned force is released after welding, the outermost tape 2 outside the slit-shaped opening 10 returns to its original shape, and the damper wire 7 is tensioned between the pair of opposing outermost tapes 2. The tape-shaped grid element 3 is stretched in a direction crossing the tape-shaped grid element 3 while maintaining the state. As a result, when the tape-shaped grid element 3 vibrates due to various external impacts, the vibration can be rapidly attenuated by the frictional resistance between the damper wire 7 and the tape-shaped grid element 3.

As in the first embodiment, at least a part of the side surface of the damper wire 7 is flat, and is in surface contact with the aperture grill 1. For example, the cross section C orthogonal to the longitudinal direction shown in FIG. 3A is substantially square (substantially square).
The cross section C orthogonal to the longitudinal direction shown in FIG. 3B is substantially triangular (substantially equilateral triangle), or the cross section C orthogonal to the longitudinal direction shown in FIG. 3C is substantially semicircular (arc and chord). For example, the surface A is a contact surface with the aperture grill 1. In the damper wire having each of the cross-sectional shapes described above, the corners may be appropriately rounded. Above damper wire 7
Is so as to sufficiently contact each tape-shaped grid body 3
It is tensioned with a tension less than the breaking strength of the damper wire 7.

According to the cathode ray tube of the present embodiment, since the damper wire and the color selection mask (tape grid element of the aperture grill) are in surface contact, the frictional resistance between them can be increased. Therefore, when the tape-shaped grid body vibrates due to various external impacts, the vibration can be damped more quickly. In addition, even if the color selection mask body such as the aperture grill becomes substantially flat, the damper wire can contact each tape-shaped grid element body of the color selection mask body with sufficient frictional resistance, and display. It is possible to cope with a flat screen. Further, since the frictional resistance between the damper wire and the color selection mask body increases, it is possible to make the damper wire thinner, whereby the shadow created by the damper wire can be made inconspicuous. INDUSTRIAL APPLICABILITY The present invention can be preferably applied to a cathode ray tube having a flat and large display screen and a high definition.

The present invention is not limited to the above embodiment. For example, the shape of the damper wire is not limited to the shape illustrated in the embodiment, and may be any shape as long as at least a part of the side surface is flat and can make surface contact with a color selection mask such as an aperture grill. Further, the material of the damper wire is not limited to tungsten, and other materials can be used. Further, as the means for fixing the damper wire so as to be in contact with the color selection mask body, the above-described two embodiments have been described. However, fixing means other than the above may be used. The present invention can be applied not only to a cathode ray tube having a flat display screen, but also to a conventional cathode ray tube having a display screen having a curved surface to some extent. In addition, various modifications can be made within the scope of the present invention.

[0032]

According to the cathode ray tube of the present invention, there is provided a color selection mask comprising a plurality of tape-like grid elements provided at a predetermined pitch between a pair of support members facing each other on a frame;
In a cathode ray tube having a damper wire for vibration prevention stretched on the surface of the color selection mask body, a cross section orthogonal to the longitudinal direction has a polygonal shape, or a shape surrounded by an arc and a chord such as a circular arc, At least a part of the side surface of the damper wire is flat and is in surface contact with the color selection mask body.
Therefore, since the damper wire and the color selection mask body, which have been in contact with each other in the past, are brought into surface contact, the frictional resistance between the two can be increased, and the tape-like grid element can be caused by various external impacts. When the body vibrates, the vibration can be damped faster. In addition, even if the color selection mask body such as the aperture grill becomes substantially flat, the damper wire can contact each tape-shaped grid element body of the color selection mask body with sufficient frictional resistance, and display. It is possible to cope with a flat screen. Furthermore, it is possible to make the damper wire thinner by the increase in the frictional resistance between the damper wire and the color selection mask body, so that the shadow created by the damper wire can be made inconspicuous.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of a cathode ray tube according to the present invention and a conventional example.

FIG. 2A is a schematic perspective view of an aperture grille assembly according to a first embodiment of the present invention and a conventional example, and FIG. 2B is an enlarged view of a damper spring portion.

FIGS. 3A to 3C are partial cross-sectional perspective views of a damper wire according to the present invention.

FIG. 4A is a schematic perspective view of an aperture grille assembly according to a second embodiment of the present invention, and FIG.
Is an enlarged view of the endmost tape portion.

FIG. 5 is a partially sectional perspective view of a damper wire according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Aperture grille, 2 ... most end tape, 3 ... Tape grid element body, 4 ... Arm member, 5 ... Support member, 7 ... Damper wire, 8 ... Damper spring, 8a ... Frame welding part, 8b ... Bending piece, 8c: Stainless steel tape, 1
0 ... Slit-shaped opening, 11 ... Support piece, 20a ... Panel, 20b ... Funnel, 20c ... Neck, 21 ... Electron gun, 22 ... Spring holder, 23 ... Spring, 2
3a: fitting hole, 24: protrusion, A: contact surface, C: cross section orthogonal to the longitudinal direction.

Claims (5)

[Claims] 1. A color selection mask body comprising a plurality of tape-shaped grid elements provided at a predetermined pitch between a pair of opposed support members of a frame, and a vibration prevention stretched on a surface of the color selection mask body. A cathode ray tube having a damper wire for use in a cathode ray tube, wherein at least a part of a side surface of the damper wire is flat and is in surface contact with the color selection mask body. 2. The cathode ray tube according to claim 1, wherein a cross section orthogonal to a longitudinal direction of said damper wire has a substantially polygonal shape. 3. The cathode ray tube according to claim 1, wherein a cross section orthogonal to the longitudinal direction of the damper wire has a shape surrounded by a substantially arc and a chord. 4. The cathode ray tube according to claim 1, wherein both ends of the damper wire are fixed to one end of a damper spring, and the other end of the damper spring is fixed to the frame. 5. A slit-shaped opening for attaching said damper wire is provided in a pair of endmost tapes facing each other of said color selection mask body, and said endmost tape portion outside said slit-shaped opening is provided on said endmost tape portion. 2. The cathode ray tube according to claim 1, wherein both ends of the damper wire are fixed.